Evaluating Improper Integrals Using Polar Coordinates

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SUMMARY

The discussion focuses on evaluating improper integrals using polar coordinates, specifically the integral of e^(-10(x^2+y^2))dxdy, which is calculated to be π/10. For the second part, the integral from negative infinity to positive infinity of e^(-10x^2)dx can be simplified by recognizing that the first integral can be expressed as the product of two identical integrals, one for x and one for y. This approach eliminates the need for further integration in part B.

PREREQUISITES
  • Understanding of polar coordinates in calculus
  • Familiarity with improper integrals
  • Knowledge of exponential functions and their properties
  • Experience with integration techniques
NEXT STEPS
  • Study the derivation of integrals in polar coordinates
  • Learn about improper integrals and their convergence
  • Explore the properties of exponential decay functions
  • Practice splitting multi-variable integrals into simpler components
USEFUL FOR

Students studying calculus, particularly those focusing on multivariable calculus and improper integrals, as well as educators seeking to enhance their teaching methods in these areas.

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Homework Statement



A.Using polar coordinates, evaluate the improper integral of e^(-10(x^2+y^2))dxdy
B. use part A to integrate from negative infinity to positive infinity of e^(-10x^2)dx

2. Homework Equations [/b]



The Attempt at a Solution



i got part A to be pi/10, but for part B i clueless, can someone please give me a hit on how to integrate it!
 
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pi/10 looks ok. But for the second part you aren't supposed to do another integration. You are supposed to realize the first integral can be split into the product of a dx integral and a dy integral both of which look the same. Use exp(-10(x^2+y^2))=exp(-10x^2)*exp(-10y^2).
 

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